DOI: 10.1038/ngeo2102
论文题名: Locking of the Chile subduction zone controlled by fluid pressure before the 2010 earthquake
作者: Moreno M. ; Haberland C. ; Oncken O. ; Rietbrock A. ; Angiboust S. ; Heidbach O.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 4 起始页码: 292
结束页码: 296
语种: 英语
Scopus关键词: Chile earthquake 2010
; earthquake magnitude
; earthquake recurrence
; earthquake rupture
; fluid pressure
; P-wave
; pore pressure
; S-wave
; seismic tomography
; subduction zone
; wave velocity
英文摘要: Constraints on the potential size and recurrence time of strong subduction-zone earthquakes come from the degree of locking between the down-going and overriding plates, in the period between large earthquakes. In many cases, this interseismic locking degree correlates with slip during large earthquakes or is attributed to variations in fluid content at the plate interface. Here we use geodetic and seismological data to explore the links between pore-fluid pressure and locking patterns at the subduction interface ruptured during the magnitude 8.8 Chile earthquake in 2010. High-resolution three-dimensional seismic tomography reveals variations in the ratio of seismic P-to S-wave velocities (V p /V s) along the length of the subduction-zone interface. High V p /V s domains, interpreted as zones of elevated pore-fluid pressure, correlate spatially with parts of the plate interface that are poorly locked and slip aseismically. In contrast, low V p /V s domains, interpreted as zones of lower pore-fluid pressure, correlate with locked parts of the plate interface, where unstable slip and earthquakes occur. Variations in pore-fluid pressure are caused by the subduction and dehydration of a hydrothermally altered oceanic fracture zone. We conclude that variations in pore-fluid pressure at the plate interface control the degree of interseismic locking and therefore the slip distribution of large earthquake ruptures. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106576
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: GFZ Helmholtz Centre Potsdam, German Research Centre for Geosciences, Telegrafenberg 14473 Potsdam, Germany; School of Environmental Sciences, University of Liverpool, Liverpool L69 3GP, United Kingdom
Recommended Citation:
Moreno M.,Haberland C.,Oncken O.,et al. Locking of the Chile subduction zone controlled by fluid pressure before the 2010 earthquake[J]. Nature Geoscience,2014-01-01,7(4)